As several posters suggest, chopping and changing camera systems may not provide the results you are seeking That achievement lies entirely within you.
Asking others to make choices for you is basically evading the point - what system and which lenses suit you best? Only you can make this decision. You alone will know best what your interests and preferred subjects are, in which directions you intend to go in your future photography, and how you want to go about it.
In my long lifetime (I'm in my 70s) I have worked with three major camera systems - Rolleiflex, Nikon and Contax G. I still have and use cameras in the three systems - including the first Rollei TLR I bought, a 2.5E2 I bought in 1964, also several others I purchased in the 1990s and lastly, a greatly loved Rolleicord Vb I picked up in 2016. Alas, I nowadays shoot less film than digital. As for my Nikons, I got into the brand in the 1970s with two Nikkormat ELs and then added FT2s and, about 15 years ago, two F65s (aka N65). My digital Nikons were D90s, D700s and this year a new D800. I also have a good selection of Nikkors both manual and autofocus, and a small but greatly loved range of Contax G Zeiss lenses which I use when I travel. Alas, my F series Nikkor lenses almost never get used now and I seem to be making the most of four D lenses (20, 28, 60 and 180). As for the Nikkormats, I fully intend to take them out of mothballs and shoot with them before I move on to that big darkroom in the sky, long from now may this be.
My most used lens in the Nikkor 28, followed by the 85, then the 60 micro. YMMD, of course. Again, you will know best what the answer to this is.
To sum this up, as I see it, the camera system that will best suit you is the one that will give you the results you want with the least fuss and bother. For me, this would be my Nikons which I've used and greatly loved since 1974, then the Rolleis, and finally the Contax G1 system.
I wish you the best of luck and all the enjoyment you can possibly attain from your quest for a system. It can be (almost) as much fun to seek (and I hope, find) as it is to use the equipment, although without careful consideration as to what you intend to buy and why, moving into a new system in this day and age can be fatal to your finances.
Above all else, enjoy the quest.
(Added later) As your focus (pun intended) seems to be Leica, I bought into the M system in the mid 1980s. And it almost bankrupted me. At the time I was a poor newspaper journalist, and buying an M2 and M3 and three lenses cost me almost half a year's income, as well as another nail in my (future) divorce. A year later I sold the entire lot. Too poor at the time to be into Leicas, and now, in the so-called wisdom of old age, too wise to go down that costly road again. A cautionary tale here.
